Question

我有一个gridview，在编辑部分有下拉列表，我想在编辑时绑定数据库中的selectedvalue。在设计器部分中没有SelectedValue属性，它给出了运行时错误。怎么办？有没有办法从代码隐藏处理它？</ p>

<asp:TemplateField HeaderText="Company">
                <EditItemTemplate>
                    <asp:DropDownList ID="DDLCompany" runat="server" DataValueField="cname" DataTextField="cname" SelectedValue = '<%# Bind("cname") %>'  >
                    </asp:DropDownList>
                </EditItemTemplate>
                <ItemTemplate>
                <asp:Label ID="CompanyLabel" runat="server" Text='<%# Bind("cname") %>'></asp:Label>
                </ItemTemplate>   
             </asp:TemplateField>

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DropDownList DDLCompany = (DropDownList)e.Row.FindControl("DDLCompany");
            DropDownList DDLPrinter = (DropDownList)e.Row.FindControl("DDLPrinter");

            if (DDLCompany != null)
            {
                DDLCompany.DataSource = userobj.FetchCompanyList();
                DDLCompany.DataBind();
                DDLCompany.SelectedValue = GridView1.DataKeys[e.Row.RowIndex].Values[0].ToString();                
            }

            if (DDLPrinter != null)
            {
                DDLPrinter.DataSource = userobj.FetchPrinterList();
                DDLPrinter.DataBind();
                DDLPrinter.SelectedValue = GridView1.DataKeys[e.Row.RowIndex].Values[0].ToString();
            }
        }
    }

Answer 1

在Codebehind中你必须检查对于e.Row.RowType == DataControlRowType.DataRow ＆amp;＆amp; e.Row.RowState == DataControlRowState.Edit in 在你找到你之前的RowDataBound Dropdwonlist。 http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridviewrow.dataitem.aspx
在aspx上你可以设置 seletcedvalue以下列方式： http://msdn.microsoft.com/en-us/library/ms178294.aspx

DropDown列表的SelectedValue

1 个答案: